The primary objective is to assess the burden of respiratory disease in outpatient settings among 32 to 35 weeks' gestational age (wGA) infants in the USA who did not receive RSV prophylaxis during the infants' first RSV season.

Detailed Description

The primary objective is to determine the burden of RSV disease in outpatient settings among 32 to 35 wGA infants in the USA who did not receive RSV prophylaxis, as measured by rate of RSV-associated outpatient lower respiratory tract illness (LRI) during the infants' first RSV season.